Standard Airfish (oz15521)

About this Plan

Standard Airfish. Radio control powered glider model. Wingspan: 2450 mm. Uses Jedelsky style wing construction.

Note main pic showing completed Standard Airfish model built by Hannes Deutsch was found online at www.deutec.at/modellflug/modelle/segler... and that page is highly recommended, with lots more excellent build pics and notes.

Quote (google-translated): "About the design: The performance of the 'bird profile' of the open standard design, which is superior to all other profile shapes and is reflected in the lowest possible sink rate, especially at higher wing loadings, allows the optimal design of an all-round RC glider in a very satisfactory way, which can be used on slopes and on the flat by high take-off or with a motor attachment and which delivers excellent flight performance over a wide speed range.

The underlying relatively high average wing loading of over 30 gr/dm2, in conjunction with the profile of the open standard design, which can be trimmed to the lowest profile drag in a sufficiently wide angle of attack range, makes it possible on the one hand to achieve a sufficiently high flight speed to be able to fly even in stronger winds.

On the other hand, even with this wing loading, a very low minimum sink rate can still be achieved, so that the best gliding ability for thermal and slope lift is also provided for flight in calm or light winds.

For example, the Standard Airfish can soar on a slope (with a natural slope angle) in winds of 2-12 m/sec, whereby the required flight speed can only be achieved by trimming the elevator.

Due to the extraordinary performance of the wing profile, more significant concessions in terms of shape and flight stability could also be made. For example, trapeze wings could be chosen in the direction of aesthetic design, and the design in terms of flight stability went so far that the model achieved full inherent stability.

The higher surface loading allows an extremely robust model for practical flight.

Open standard construction of the wing, simple construction of the fuselage and tail unit and the completely prefabricated parts of the entire model enable uncomplicated, quick construction with few tools and without any slipway.

This ease of manufacture in combination with the All-round usability, inherent stability and robustness make the model the ideal introduction and training model for RC gliding.

The proven learning and experience sequence: flight in calm and light winds, flight in light winds on a slope, to flight in strong winds on a slope, where flying and landing can be learned step by step and at the same time the flying experience is constantly increased. This makes a single all-round model possible - the 'Standard Airfish'.

Attaching the Bowden cable inner tubes: The Bowden cable inner tubes are attached as follows;

1. Fasten the rudder machine and horizontal stabilizer.
2. Guide the Bowden cable inner tubes from front to back through the Bowden cable outer tubes.
3. At the front: screw the lock nut and fork head onto the threaded bushing and hook the fork heads into the rudder machine.
4. Cut the Bowden cable inner tubes backwards to length.
5. Glue the rear threaded bushings with UHU-plus or Stabilit, to do this, unhook the elevator Bowden cable inner tube from the rudder machine and push it backwards as far as possible.

Lubricate the rudder horns to ensure that the fork heads move smoothly!

On the position of the center of gravity:

The position of the center of gravity can deviate from the normal position within relatively wide limits of about plus or minus 10 mm, which is why the different weights of the RC receiver systems used and the dispersion in the wooden weights rarely have to be compensated for with additional ballast. The stable flight position is achieved by appropriate trimming of the elevator. With a normal position of the center of gravity, the position of the elevator is such that it continues the curvature of the horizontal tail fin. If the center of gravity is in front of the normal position, it is trimmed to 'pull'; if the center of gravity is behind the normal position, it is trimmed to 'push'. With the above extreme positions of the center of gravity of plus/minus 10 mm, the trim of the elevator is about plus/minus 1.5 degrees. The exact trim is determined in practice during the test flight.

Position of the high-start hook:

The normal position of the high-start hook is the position in the second to last hole of the mounting plate. When there is no wind, the high-start hook can be placed in the last hole. In stronger winds of around 5 m/sec and above, the high-start hook can be moved 1-2 holes in front of the normal position.

The engine attachment:

The GK multi-tank with a 1.5 cc engine is used for the engine attachment. The normal position of the engine pull direction up and down is given when the front tank screw connection is in the middle of the slot of the GK multi-tank when using the tank supports provided. The fine trimming of the climb is easiest to do by trimming the elevator depending on the wind strength. The engine pull direction to the side is zero. The power flight direction to the side is controlled with the rudder..."

Direct submission to Outerzone.

Quote: "Hi Mary, Steve, att you will found some files fron the Airfish Standart form h. Keinrath. Regards, Doro"

Supplementary file notes

Instructions.
Radio installation drawing.

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